SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10735, 10736, 10737, 10738, 10688, 10727, 
    10728, 10729, 10730, 10731, 10732, 
    10733, 10713, 10714, 10715, 10716, 
    10717, 10718, 10719, 10720
  )

Query time 0.00076

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (10735,10736,10737,10738,10688,10727,10728,10729,10730,10731,10732,10733,10713,10714,10715,10716,10717,10718,10719,10720)"
    }
  }
}