Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665ae13f115127d382a87b21e059705ee97644a1b98bbb9aacff50099f8d13df' 
  AND token = 'dHvUaFW5sHypkgy4fzwA7xAUcBxOlBm7BzT41tId2f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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