Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd027baceb7629d13680cc60d7b31d58fb5f1f208774ff1fd5f84bff34d9c75e' 
  AND token = 'CKfCmG560F2EDeH+oypRmM4KYUNf26rUPdqjB6W0Dt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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