Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05d763d85d7706cb3cf407ba3d830aab09dc04d74bb607c04063a01202b8c0a' 
  AND token = 'wS9EsGCBrh78FLMtnONTBr7ZDJ18i8gseKND9QRLj6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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