MD5 is not a secure method of hashing passwords, and Laravel doesn't use it. Instead it uses Bcrypt (http://laravel.com/docs/5.0/hashing).
Assuming your passwords are currently stored un-encrypted, I would suggest instead of directly using SQL, you write your script in Laravel, to handle the transfer of users into the new table, and use the Hash::make function (see the link above) to encrypt your passwords using Bcrypt.
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