Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5281eafda6da841314a6bf441a77bc03ab890d6b7fb41c473b3f5caa8b9bf6fc' 
  AND token = 'UiVRGPSO+sd3XEIxszjELVRxpHFN0QLrVSl87XsOsfk=' 
  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"
    }
  }
}