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 (
    431380, 432643, 430955, 425786, 433168, 
    420963, 435716, 436514, 419288, 424427, 
    460521, 414020, 414696, 431630, 420330, 
    439312, 427057, 405641, 426607, 407640, 
    409611, 428383, 409077, 440298, 450604, 
    455510, 402558, 401092, 442722, 442428, 
    417957, 432262, 452815, 431646, 439685, 
    440664, 451688, 410924, 423745, 420062, 
    434608, 446159, 429578, 425486, 423026, 
    435351, 456510, 404001
  )

Query time 0.00046

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 (431380,432643,430955,425786,433168,420963,435716,436514,419288,424427,460521,414020,414696,431630,420330,439312,427057,405641,426607,407640,409611,428383,409077,440298,450604,455510,402558,401092,442722,442428,417957,432262,452815,431646,439685,440664,451688,410924,423745,420062,434608,446159,429578,425486,423026,435351,456510,404001)"
        }
      }
    ]
  }
}