SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    347, 344, 343, 342, 341, 340, 339, 338, 
    335, 334, 333, 332, 331, 330, 328, 321, 
    320, 319, 318, 317
  )

Query time 0.00055

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "rows": 53,
          "filtered": 37.73584747,
          "attached_condition": "cscart_products.product_id in (347,344,343,342,341,340,339,338,335,334,333,332,331,330,328,321,320,319,318,317)"
        }
      }
    ]
  }
}