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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 (
    19405, 19406, 19407, 19408, 19409, 19410, 
    19411, 19412, 19413, 19414, 19415, 
    19416, 19417, 19418, 19419, 19420
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00036

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 (19405,19406,19407,19408,19409,19410,19411,19412,19413,19414,19415,19416,19417,19418,19419,19420)"
    }
  }
}