I got unknown message in explain analyze

analyzing sql-request(mysql 8.1) I got unknown message :

explain analyze        SELECT * 
    FROM `ts_products` 
    WHERE `slug` = 'product-nisi-repellat-placeat-excepturi-impedit-beatae-sint-itaque-tempore-quisquam-facilis-sed'     AND `ts_products`.`status` = 'A' limit 1
-> Limit: 1 row(s)  (cost=0.00..0.00 rows=1) (actual time=0.002..0.002 rows=1 loops=1)
-> Rows fetched before execution  (cost=0.00..0.00 rows=1) (actual time=0.000..0.000 rows=1 loops=1)

“Rows fetched before execution” - I do not remember such message I manuals I read did not find this line in net.
Is it good performance(as I expexct) ? I have in table :

CREATE TABLE `ts_products` (
  `id` bigint unsigned NOT NULL AUTO_INCREMENT,
  `slug` varchar(260) COLLATE utf8mb4_unicode_ci NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `products_slug_index` (`slug`),