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 (
    369578, 276919, 276920, 392486, 392485, 
    392484, 392487, 392446, 392445, 432451, 
    429770, 435270, 432222, 435508, 432333, 
    435503, 435523, 435520
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00039

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": 18,
      "filtered": "94.74",
      "cost_info": {
        "read_cost": "2.27",
        "eval_cost": "3.60",
        "prefix_cost": "5.87",
        "data_read_per_join": "288"
      },
      "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 (369578,276919,276920,392486,392485,392484,392487,392446,392445,432451,429770,435270,432222,435508,432333,435503,435523,435520)))"
    }
  }
}