slow query.

Hello, I use the Query Monitor plugin on my site and when I installed your Subscribe to Category plugin and immediately, it warns me of a slow query…
If you can see, thank you, because plugin very well and very functional what I was looking for a while.

Query Monitor Info
Query :
SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_name = ‘wp_stc_joblist’
AND column_name = ‘mobile_phone’

Caller:
STC_Subscribe->init()
wp-content/plugins/subscribe-to-category/classes/class-stc-subscribe.php:91
STC_Subscribe->__construct()
wp-content/plugins/subscribe-to-category/classes/class-stc-subscribe.php:63

The page I need help with: [log in to see the link]