SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10394, 10393, 10392, 10386, 10389, 10388, 
    10637, 10638, 10639, 10640, 10641, 
    10744, 10745, 10746, 9905, 10168, 10041, 
    10643, 10606, 10094
  )

Query time 0.00046

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 (10394,10393,10392,10386,10389,10388,10637,10638,10639,10640,10641,10744,10745,10746,9905,10168,10041,10643,10606,10094)"
    }
  }
}