SELECT 
  pf.feature_id, 
  pf.company_id, 
  pf.feature_type, 
  pf.parent_id, 
  pf.display_on_product, 
  pf.display_on_catalog, 
  pf.display_on_header, 
  cscart_product_features_descriptions.description, 
  cscart_product_features_descriptions.internal_name, 
  cscart_product_features_descriptions.lang_code, 
  cscart_product_features_descriptions.prefix, 
  cscart_product_features_descriptions.suffix, 
  pf.categories_path, 
  cscart_product_features_descriptions.full_description, 
  pf.status, 
  pf.comparison, 
  pf.position, 
  pf.purpose, 
  pf.feature_style, 
  pf.filter_style, 
  pf.feature_code, 
  pf.timestamp, 
  pf.updated_timestamp, 
  pf_groups.position AS group_position, 
  cscart_product_features_values.value, 
  cscart_product_features_values.variant_id, 
  cscart_product_features_values.value_int 
FROM 
  cscart_product_features AS pf 
  LEFT JOIN cscart_product_features AS pf_groups ON pf.parent_id = pf_groups.feature_id 
  LEFT JOIN cscart_product_features_descriptions AS pf_groups_description ON pf_groups_description.feature_id = pf.parent_id 
  AND pf_groups_description.lang_code = 'en' 
  LEFT JOIN cscart_product_features_descriptions ON cscart_product_features_descriptions.feature_id = pf.feature_id 
  AND cscart_product_features_descriptions.lang_code = 'en' 
  INNER JOIN cscart_product_features_values ON cscart_product_features_values.feature_id = pf.feature_id 
  AND cscart_product_features_values.product_id = 391030 
  AND cscart_product_features_values.lang_code = 'en' 
WHERE 
  1 = 1 
  AND pf.feature_type != 'G' 
  AND pf.status IN ('A') 
  AND (
    pf_groups.status IN ('A') 
    OR pf_groups.status IS NULL
  ) 
  AND pf.company_id IN (0, 1) 
  AND pf.display_on_product = 'Y' 
  AND (
    pf.categories_path = '' 
    OR ISNULL(pf.categories_path) 
    OR FIND_IN_SET(166, pf.categories_path) 
    OR FIND_IN_SET(478, pf.categories_path)
  ) 
GROUP BY 
  pf.feature_id 
ORDER BY 
  group_position asc, 
  pf_groups_description.description asc, 
  pf_groups.feature_id asc, 
  pf.position asc, 
  cscart_product_features_descriptions.description asc, 
  pf.feature_id asc

Query time 0.00119

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.017594128,
    "filesort": {
      "sort_key": "pf_groups.position, pf_groups_description.description, pf_groups.feature_id, pf.position, cscart_product_features_descriptions.description, pf.feature_id",
      "temporary_table": {
        "nested_loop": [
          {
            "table": {
              "table_name": "cscart_product_features_values",
              "access_type": "ref",
              "possible_keys": [
                "PRIMARY",
                "fl",
                "lang_code",
                "product_id",
                "fpl",
                "idx_product_feature_variant_id"
              ],
              "key": "product_id",
              "key_length": "3",
              "used_key_parts": ["product_id"],
              "ref": ["const"],
              "loops": 1,
              "rows": 4,
              "cost": 0.00889648,
              "filtered": 37.87878799,
              "index_condition": "cscart_product_features_values.lang_code = 'en'",
              "attached_condition": "cscart_product_features_values.product_id <=> 391030"
            }
          },
          {
            "table": {
              "table_name": "pf",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY", "status", "company_id"],
              "key": "PRIMARY",
              "key_length": "3",
              "used_key_parts": ["feature_id"],
              "ref": [
                "u985510652_ecartify.cscart_product_features_values.feature_id"
              ],
              "loops": 1.515151515,
              "rows": 1,
              "cost": 0.002174412,
              "filtered": 100,
              "attached_condition": "pf.feature_type <> 'G' and pf.`status` = 'A' and pf.company_id in (0,1) and pf.display_on_product = 'Y' and (pf.categories_path = '' or pf.categories_path is null or find_in_set(166,pf.categories_path) or find_in_set(478,pf.categories_path))"
            }
          },
          {
            "table": {
              "table_name": "pf_groups",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "3",
              "used_key_parts": ["feature_id"],
              "ref": ["u985510652_ecartify.pf.parent_id"],
              "loops": 1.515151515,
              "rows": 1,
              "cost": 0.002174412,
              "filtered": 100,
              "attached_condition": "trigcond(pf_groups.`status` = 'A' or pf_groups.`status` is null)"
            }
          },
          {
            "table": {
              "table_name": "pf_groups_description",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "9",
              "used_key_parts": ["feature_id", "lang_code"],
              "ref": ["u985510652_ecartify.pf.parent_id", "const"],
              "loops": 1.515151515,
              "rows": 1,
              "cost": 0.002174412,
              "filtered": 100,
              "attached_condition": "trigcond(pf_groups_description.lang_code = 'en')"
            }
          },
          {
            "table": {
              "table_name": "cscart_product_features_descriptions",
              "access_type": "eq_ref",
              "possible_keys": ["PRIMARY"],
              "key": "PRIMARY",
              "key_length": "9",
              "used_key_parts": ["feature_id", "lang_code"],
              "ref": [
                "u985510652_ecartify.cscart_product_features_values.feature_id",
                "const"
              ],
              "loops": 1.515151515,
              "rows": 1,
              "cost": 0.002174412,
              "filtered": 100,
              "attached_condition": "trigcond(cscart_product_features_descriptions.lang_code = 'en')"
            }
          }
        ]
      }
    }
  }
}