Mysql load to 100% after update tot 5.5.1

After the security update from last night we run into this problem with loads of these queries:

SELECT SQL_CALC_FOUND_ROWS wp_posts.*, low_stock_amount_meta.meta_value AS low_stock_amount, MAX( product_lookup.date_created ) AS last_order_date FROM wp_posts LEFT JOIN wp_wc_product_meta_lookup wc_product_meta_lookup ON wp_posts.ID = wc_product_meta_lookup.product_id LEFT JOIN wp_postmeta AS low_stock_amount_meta ON wp_posts.ID = low_stock_amount_meta.post_id AND low_stock_amount_meta.meta_key = '_low_stock_amount' LEFT JOIN wp_wc_order_product_lookup product_lookup ON wp_posts.ID = CASE WHEN wp_posts.post_type = 'product' THEN product_lookup.product_id WHEN wp_posts.post_type = 'product_variation' THEN product_lookup.variation_id END WHERE 1=1 AND wp_posts.post_type IN ('product', 'product_variation') AND ((wp_posts.post_status = 'publish')) AND wc_product_meta_lookup.stock_quantity IS NOT NULL AND wc_product_meta_lookup.stock_status IN('instock','outofstock') AND ( ( low_stock_amount_meta.meta_value > '' AND wc_product_meta_lookup.stock_quantity <= CAST(low_stock_amount_meta.meta_value AS SIGNED) ) OR ( ( low_stock_amount_meta.meta_value IS NULL OR low_stock_amount_meta.meta_value <= '' ) AND wc_product_meta_lookup.stock_quantity <= 2 ) ) GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC, wp_posts.ID DESC LIMIT 0, 1

This shop has more than 8k products with variation so we are not suprised this query takes over 100 seconds

Any one also experiencing this?