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 (
    7351, 7402, 7293, 7286, 7378, 7329, 7324, 
    7310, 20536, 7300, 7352, 7390, 7355, 
    20534, 7289, 7322, 7325, 7376, 7284, 
    7366, 7367, 7398, 7381, 7375, 7404, 
    7391, 7369, 7371, 7349, 20532, 7401, 
    30641, 7345, 21386, 7308, 20537, 7317, 
    32019, 60432, 30632, 30633, 7297, 7361, 
    32119, 32177, 7312, 32142, 7385, 32153, 
    32036
  )

Query time 0.00100

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "71.16"
    },
    "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": 51,
          "rows_produced_per_join": 51,
          "filtered": "100.00",
          "index_condition": "(`cscartdb`.`p`.`product_id` in (7351,7402,7293,7286,7378,7329,7324,7310,20536,7300,7352,7390,7355,20534,7289,7322,7325,7376,7284,7366,7367,7398,7381,7375,7404,7391,7369,7371,7349,20532,7401,30641,7345,21386,7308,20537,7317,32019,60432,30632,30633,7297,7361,32119,32177,7312,32142,7385,32153,32036))",
          "cost_info": {
            "read_cost": "30.36",
            "eval_cost": "5.10",
            "prefix_cost": "35.46",
            "data_read_per_join": "816"
          },
          "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": [
            "cscartdb.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 51,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "12.75",
            "eval_cost": "5.10",
            "prefix_cost": "53.31",
            "data_read_per_join": "19K"
          },
          "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": [
            "cscartdb.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 51,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "12.75",
            "eval_cost": "5.10",
            "prefix_cost": "71.16",
            "data_read_per_join": "5K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}