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 (
    66153, 66154, 66155, 66170, 66179, 66180, 
    66184, 65388, 65403, 65404, 65406, 
    65407, 65409, 65411, 65412, 65413, 
    65414, 65415, 65417, 65433, 65464, 
    66147, 66183, 65387, 65410, 65418, 
    65482, 65459, 65395, 65457, 65399, 
    65396
  )

Query time 0.00067

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "56.01"
    },
    "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": 32,
          "rows_produced_per_join": 32,
          "filtered": "100.00",
          "index_condition": "(`cscart_db`.`p`.`product_id` in (66153,66154,66155,66170,66179,66180,66184,65388,65403,65404,65406,65407,65409,65411,65412,65413,65414,65415,65417,65433,65464,66147,66183,65387,65410,65418,65482,65459,65395,65457,65399,65396))",
          "cost_info": {
            "read_cost": "19.21",
            "eval_cost": "3.20",
            "prefix_cost": "22.41",
            "data_read_per_join": "512"
          },
          "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": [
            "cscart_db.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 32,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "8.00",
            "eval_cost": "3.20",
            "prefix_cost": "33.61",
            "data_read_per_join": "12K"
          },
          "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": [
            "cscart_db.p.group_id"
          ],
          "rows_examined_per_scan": 2,
          "rows_produced_per_join": 64,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "16.00",
            "eval_cost": "6.40",
            "prefix_cost": "56.01",
            "data_read_per_join": "6K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}