MySQL EXPLAIN statement still says "Using where" in the Extra column after creating an index.

Hey guys, I'm having trouble understanding why the "Extra" column from the EXPLAIN statement still says "Using where" after I created an index on the users table provided with the lesson.

Here's the code I used to create the index:

CREATE INDEX last_name_idx ON users(last_name);

And here's the code I used to query the table:

EXPLAIN SELECT * FROM users WHERE last_name = "Chalkley";

It lists last_name_idx as the possible key and key used, the type column says "ref", and it says it's searching only one row, yet it doesn't say "Using index condition" like it does when Andrew does it.

I'm using MySQL workbench on a localhost with MySQL 5.5, but I created a simple table on my web server (with version 5.5 installed), and added an index in the same manner, but got the same result of "Using where".

Thanks for your help!

Kyle