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 (
    7401, 7394, 7462, 7420, 7400, 7441, 7035, 
    7410, 7393, 7402, 7409, 7404, 7396, 
    7395, 7403, 7405, 7034, 7399, 7407, 
    7447, 7408, 7434, 7448, 7360, 7449, 
    7458, 7421, 7424, 7433, 7425, 7436, 
    7440, 7444, 7445, 7457, 7459, 7460, 
    7428, 7442, 7461, 7463, 7426, 7432, 
    7453, 7398, 7451, 7452, 7397, 7450, 
    7454, 7455, 7456, 7358
  )

Query time 0.00055

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "74.21"
    },
    "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": 53,
          "rows_produced_per_join": 53,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`p`.`product_id` in (7401,7394,7462,7420,7400,7441,7035,7410,7393,7402,7409,7404,7396,7395,7403,7405,7034,7399,7407,7447,7408,7434,7448,7360,7449,7458,7421,7424,7433,7425,7436,7440,7444,7445,7457,7459,7460,7428,7442,7461,7463,7426,7432,7453,7398,7451,7452,7397,7450,7454,7455,7456,7358))",
          "cost_info": {
            "read_cost": "31.81",
            "eval_cost": "5.30",
            "prefix_cost": "37.11",
            "data_read_per_join": "848"
          },
          "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": [
            "softwarepirmam_hewadelivard_cscart_4.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 53,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "13.25",
            "eval_cost": "5.30",
            "prefix_cost": "55.66",
            "data_read_per_join": "20K"
          },
          "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": [
            "softwarepirmam_hewadelivard_cscart_4.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 53,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "13.25",
            "eval_cost": "5.30",
            "prefix_cost": "74.21",
            "data_read_per_join": "5K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}