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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 (
    19517, 19518, 19519, 19520, 19521, 19522, 
    19523, 19524, 19525, 19526, 19527, 
    19528, 19529, 19530, 19531, 19532
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00021

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 (19517,19518,19519,19520,19521,19522,19523,19524,19525,19526,19527,19528,19529,19530,19531,19532)"
    }
  }
}