for i in $(mysql -e 'show processlist;' | awk '/database/ && /SELECT/' | awk '$6 > 10 {print $1}'); do echo "Killing query number: " $i; echo "KILL " "$i" ";"| mysql; done

This one-liner kills the queries obtained through the following information:

Database: database
Query : SELECT
Time : 10 seconds +


Change the information above in the one-liner to tailor to your needs