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 (
    3773, 3774, 3775, 3776, 3777, 1143, 1139, 
    1140, 1141, 1142, 3681, 3682, 3683, 
    3684, 3685, 2207, 2208, 2209, 2210, 
    2211, 2212, 2213, 2214, 2215, 2216, 
    5808, 5809, 5810, 5811, 5812, 5813, 
    5814, 5815, 5816, 1654, 1655, 1656, 
    1657, 1658, 1659, 1660, 1661, 1662, 
    1663, 1664, 1665, 1666, 1667
  )

Query time 0.00314

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "168.01"
    },
    "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": 48,
          "rows_produced_per_join": 48,
          "filtered": "100.00",
          "index_condition": "(`test2_gaseus`.`p`.`product_id` in (3773,3774,3775,3776,3777,1143,1139,1140,1141,1142,3681,3682,3683,3684,3685,2207,2208,2209,2210,2211,2212,2213,2214,2215,2216,5808,5809,5810,5811,5812,5813,5814,5815,5816,1654,1655,1656,1657,1658,1659,1660,1661,1662,1663,1664,1665,1666,1667))",
          "cost_info": {
            "read_cost": "28.81",
            "eval_cost": "4.80",
            "prefix_cost": "33.61",
            "data_read_per_join": "768"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "test2_gaseus.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 48,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "12.00",
            "eval_cost": "4.80",
            "prefix_cost": "50.41",
            "data_read_per_join": "18K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "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": [
            "test2_gaseus.p.group_id"
          ],
          "rows_examined_per_scan": 7,
          "rows_produced_per_join": 336,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "84.00",
            "eval_cost": "33.60",
            "prefix_cost": "168.01",
            "data_read_per_join": "34K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}