SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    559549, 559470, 559472, 559469, 559473, 
    559471, 559465, 559467, 559468, 559544, 
    559474, 559466, 559507, 559508, 559509
  )

Query time 0.00082

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": 15,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (559549,559470,559472,559469,559473,559471,559465,559467,559468,559544,559474,559466,559507,559508,559509)"
    }
  }
}