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 (
    85974, 85975, 85977, 85978, 85979, 85980, 
    85981, 85982, 85983, 85984, 85985, 
    85986, 85987, 85988, 85989, 85990, 
    85991, 85992, 85993, 85994, 85995, 
    85996, 85997, 85998, 85999, 86003, 
    86004, 86005, 86006, 86007, 86008, 
    86009, 86010, 86011, 86012, 86014, 
    86015, 86017, 86018, 86019, 86020, 
    86021, 86022, 86023, 86024, 86025, 
    86026, 86027, 86028, 86029, 86030, 
    86031, 86032, 86033, 86034, 86035, 
    86036, 86037, 86038, 86039, 86040, 
    86041, 86042, 86043, 86044, 86045, 
    86046, 86047, 86048, 86049, 86050, 
    86051, 86052, 86053, 86054, 86055, 
    86056, 86057, 86058, 86059, 86060, 
    86062, 86064, 86065, 86066, 86068
  )

Query time 0.00103

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.05"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "f",
          "access_type": "ALL",
          "possible_keys": [
            "idx_group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "0.35",
            "data_read_per_join": "104"
          },
          "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": [
            "nuie_scalesta_net.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "0.70",
            "data_read_per_join": "400"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "table": {
          "table_name": "p",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "nuie_scalesta_net.f.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "index_condition": "(`nuie_scalesta_net`.`p`.`product_id` in (85974,85975,85977,85978,85979,85980,85981,85982,85983,85984,85985,85986,85987,85988,85989,85990,85991,85992,85993,85994,85995,85996,85997,85998,85999,86003,86004,86005,86006,86007,86008,86009,86010,86011,86012,86014,86015,86017,86018,86019,86020,86021,86022,86023,86024,86025,86026,86027,86028,86029,86030,86031,86032,86033,86034,86035,86036,86037,86038,86039,86040,86041,86042,86043,86044,86045,86046,86047,86048,86049,86050,86051,86052,86053,86054,86055,86056,86057,86058,86059,86060,86062,86064,86065,86066,86068))",
          "cost_info": {
            "read_cost": "0.25",
            "eval_cost": "0.10",
            "prefix_cost": "1.05",
            "data_read_per_join": "16"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      }
    ]
  }
}