Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921536947933b71aa1338197b5a6889f6001b06bef2e1e552a9f2d7447bc43b7' 
  AND token = 'UqOZMJfS5JVmSV4VfWLIDNK56CWCukLvq3t1l8/SXdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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