Login into PHPMyAdmin, execute the query below:

SELECT * FROM `wp_options` WHERE `option_name` LIKE 'active_plugins' ORDER BY `option_name` ASC

Then, update the keys to:

a:0:{}

Technically, the SQL shortcut is:

UPDATE `wp_options` SET `option_value` = 'a:0:{}' WHERE `wp_options`.`option_id` = 33;