SELECT 
  cscart_product_review_prepared_data.product_id AS product_id, 
  cscart_product_review_prepared_data.average_rating AS average_rating, 
  cscart_product_review_prepared_data.reviews_count AS reviews_count 
FROM 
  cscart_product_review_prepared_data 
WHERE 
  cscart_product_review_prepared_data.product_id IN (
    371809, 371810, 371803, 371801, 371806, 
    371800, 371805, 371802, 371811, 371804, 
    371812, 371807, 371813, 371808, 371814, 
    371817, 371815
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "5.87"
    },
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": [
        "PRIMARY"
      ],
      "rows_examined_per_scan": 19,
      "rows_produced_per_join": 16,
      "filtered": "89.47",
      "cost_info": {
        "read_cost": "2.47",
        "eval_cost": "3.40",
        "prefix_cost": "5.87",
        "data_read_per_join": "271"
      },
      "used_columns": [
        "product_id",
        "storefront_id",
        "average_rating",
        "reviews_count"
      ],
      "attached_condition": "((`webmarco`.`cscart_product_review_prepared_data`.`storefront_id` = 0) and (`webmarco`.`cscart_product_review_prepared_data`.`product_id` in (371809,371810,371803,371801,371806,371800,371805,371802,371811,371804,371812,371807,371813,371808,371814,371817,371815)))"
    }
  }
}