SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10545, 10544, 10543, 10542, 10541, 10540, 
    10539, 10538, 10537, 10536, 10535, 
    10534, 10533, 10532, 10531, 10530, 
    10529, 10528, 10527, 10526
  )

Query time 0.00071

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 (10545,10544,10543,10542,10541,10540,10539,10538,10537,10536,10535,10534,10533,10532,10531,10530,10529,10528,10527,10526)"
    }
  }
}