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 (
    432307, 446699, 413014, 450688, 416995, 
    426059, 409013, 408586, 413163, 415231, 
    429505, 404254, 406411, 404724, 417300, 
    410868, 452526, 440855, 407708, 457100, 
    449639, 427186, 434226, 413616, 400971, 
    439522, 420223, 402063, 434025, 453641, 
    407875, 450825, 427907, 427353, 431455, 
    406944, 424119, 412948, 438098, 417337, 
    403309, 429951, 411429, 443819, 402148, 
    438958, 423821, 449843
  )

Query time 0.00073

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 (432307,446699,413014,450688,416995,426059,409013,408586,413163,415231,429505,404254,406411,404724,417300,410868,452526,440855,407708,457100,449639,427186,434226,413616,400971,439522,420223,402063,434025,453641,407875,450825,427907,427353,431455,406944,424119,412948,438098,417337,403309,429951,411429,443819,402148,438958,423821,449843)"
        }
      }
    ]
  }
}