Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a735f64d50e5edaf77131a74c5554b763da484f4de19bf968e1eabbf689d679' 
  AND token = 'C6SBC5LrFCKaphN8sL1KnOdnbIDWxm/88uCb3VNTSUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}