SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    409307, 457277, 406336, 406620, 414945, 
    436269, 400982, 412564, 417564, 455410, 
    437842, 458565, 458998, 421994, 407216, 
    417702, 434266, 402632, 440861, 403587, 
    436665, 450242, 443925, 427198, 401529, 
    448492, 425648, 452408, 405306, 457702, 
    445416, 400951, 438653, 423171, 459017, 
    442766, 435193, 407090, 420669, 456306, 
    438114, 431395, 405502, 415531, 435646, 
    458047, 428318, 434967
  )

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.03140489,
    "nested_loop": [
      {
        "table": {
          "table_name": "g",
          "access_type": "index",
          "possible_keys": ["PRIMARY"],
          "key": "idx_group_code",
          "key_length": "387",
          "used_key_parts": ["code"],
          "loops": 1,
          "rows": 2,
          "cost": 0.00693929,
          "filtered": 100,
          "using_index": true
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ref",
          "possible_keys": ["idx_group_id"],
          "key": "idx_group_id",
          "key_length": "3",
          "used_key_parts": ["group_id"],
          "ref": ["u985510652_ecartify.g.id"],
          "loops": 2,
          "rows": 1,
          "cost": 0.00527872,
          "filtered": 100
        }
      },
      {
        "table": {
          "table_name": "p",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "idx_group_id"],
          "key": "idx_group_id",
          "key_length": "3",
          "used_key_parts": ["group_id"],
          "ref": ["u985510652_ecartify.g.id"],
          "loops": 2,
          "rows": 8,
          "cost": 0.01918688,
          "filtered": 100,
          "index_condition": "p.product_id in (409307,457277,406336,406620,414945,436269,400982,412564,417564,455410,437842,458565,458998,421994,407216,417702,434266,402632,440861,403587,436665,450242,443925,427198,401529,448492,425648,452408,405306,457702,445416,400951,438653,423171,459017,442766,435193,407090,420669,456306,438114,431395,405502,415531,435646,458047,428318,434967)"
        }
      }
    ]
  }
}