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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 (
    19901, 19902, 19903, 19904, 19905, 19906, 
    19907, 19908, 19909, 19910, 19911, 
    19912, 19913, 19914, 19915, 19916
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": ["PRIMARY"],
      "rows": 5,
      "filtered": 100,
      "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (19901,19902,19903,19904,19905,19906,19907,19908,19909,19910,19911,19912,19913,19914,19915,19916)"
    }
  }
}