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 (
    18516, 51007, 51004, 51010, 51005, 51008, 
    51013, 51012, 51006, 51011, 51015, 
    51021, 51016, 51017, 51018, 51024, 
    51019, 51014, 51022, 51045, 51422, 
    51440, 51025, 51424, 51029, 51442, 
    51429, 51060, 51436, 51430, 51433, 
    51063, 51020, 51027, 51067, 51423, 
    51031, 51028, 51435, 51062, 51033, 
    51026, 51431, 51441, 51030, 51032, 
    51425, 51035, 51432, 51042, 51070, 
    51434, 51066, 51041, 51064, 51069, 
    51040, 51059, 51039, 51056, 51036, 
    51037, 51038, 51050, 51052, 51065, 
    51009, 51023, 51034, 51061, 51068, 
    51426, 51055, 51071, 51058
  )

Query time 0.00078

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "105.01"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 75,
          "rows_produced_per_join": 75,
          "filtered": "100.00",
          "index_condition": "(`test_uchur_k`.`p`.`product_id` in (18516,51007,51004,51010,51005,51008,51013,51012,51006,51011,51015,51021,51016,51017,51018,51024,51019,51014,51022,51045,51422,51440,51025,51424,51029,51442,51429,51060,51436,51430,51433,51063,51020,51027,51067,51423,51031,51028,51435,51062,51033,51026,51431,51441,51030,51032,51425,51035,51432,51042,51070,51434,51066,51041,51064,51069,51040,51059,51039,51056,51036,51037,51038,51050,51052,51065,51009,51023,51034,51061,51068,51426,51055,51071,51058))",
          "cost_info": {
            "read_cost": "45.01",
            "eval_cost": "7.50",
            "prefix_cost": "52.51",
            "data_read_per_join": "1K"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ref",
          "possible_keys": [
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "test_uchur_k.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 75,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "18.75",
            "eval_cost": "7.50",
            "prefix_cost": "78.76",
            "data_read_per_join": "7K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "test_uchur_k.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 75,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "18.75",
            "eval_cost": "7.50",
            "prefix_cost": "105.01",
            "data_read_per_join": "29K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      }
    ]
  }
}