Slow Query Crashing my Server

I recently set up a slow query log and This query keeps popping up:

# Query_time: 652 Lock_time: 0 Rows_sent: 1 Rows_examined: 5316
SELECT SQL_CALC_FOUND_ROWS wp_posts.* FROM wp_posts WHERE 1=1 AND wp_posts.ID NOT IN ( SELECT tr.object_id FROM wp_term_relationships AS tr INNER JOIN wp_term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy = ‘category’ AND tt.term_id IN (’30’) ) AND (wp_posts.post_author = 251) AND wp_posts.post_type = ‘post’ AND (wp_posts.post_status = ‘publish’) ORDER BY wp_posts.post_date DESC LIMIT 0, 1;

Dose anyone know what plugin uses this SQL statement?