Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa181ad4b48862a51e6381e766ffbe78b59291733f1be84f281912ad3ecf268' 
  AND token = 'txs/JVeAyCcQReiJc9VAN4FgPRbZjyjbKvWycsUOivI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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