SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    234552, 218645, 229045, 230883, 233083, 
    233764, 233916, 235216, 591794, 229091, 
    230596, 232944, 233450, 235701, 233529, 
    233637, 229623, 229679, 230360, 230714
  )

Query time 0.00135

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,
      "attached_condition": "cscart_products.product_id in (234552,218645,229045,230883,233083,233764,233916,235216,591794,229091,230596,232944,233450,235701,233529,233637,229623,229679,230360,230714)"
    }
  }
}