Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f321b802cb84420a3b66641f297462c49afaaf78dff42d31e92f231b05373c' 
  AND token = 'TuJNoQheiQ+tHB5mRaLcaJEAAVqIuA4CnIj0nX8kE+4=' 
  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"
    }
  }
}