Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a453318074c8534c4bceafa53a4df36672af96c607c750bc27e5d70c397c20' 
  AND token = 'rZr0eGCg0VTPg3LQTsgQR/cVjeGkrEkYqZfqV5Jml78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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