Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c67597d6a5f1a4dd5aaff6d8211c236c9c28485aabdd2bb65730ef96dafbc94' 
  AND token = 'yETGg5fPcI/siWDrsRxvH5OnEwIOxZK7P+TeAQKV94E=' 
  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"
    }
  }
}