When using the LIKE comparison in MySQL the query is case-insensitive by default, but if the column you are comparing is BINARY then the query will be case-sensitive. Likewise if the BINAY cast is used.
So you need to make sure that the fields' datatypes are not set to BINARY.
BTW - that query structure will not work as you expect with mysql it will query based on "Description" and ignore "EntryName".
You need to use -
SELECT *
FROM cl_entries
WHERE EntryName LIKE '%$look%'
OR Description LIKE '%$look%'
Hope this helps 😉