Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38514579fb1f5adcee94bcfd8f41cc8e7079bb033f282ab8e69bd6d0a61e4039' 
  AND token = 'rCq4SC1cUaGfjbP36ytZw3zKp6hJ3M8sUI3XQT5sqHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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