SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    55, 194, 298, 427, 428, 429, 430, 431, 
    506, 518, 519, 5473, 5474, 504, 1843, 
    1841, 1855, 1840, 1853, 486, 1854, 1842
  )

Query time 0.00079

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": 22,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (55,194,298,427,428,429,430,431,506,518,519,5473,5474,504,1843,1841,1855,1840,1853,486,1854,1842)"
    }
  }
}