It looks like you've used MySQL packages from the IUS community repo. Unfortunately these packages don't appear to be 100% compatible with the original packages, and so you get broken dependencies such as this one. Remove all of the existing MySQL packages first (your databases won't be touched) and then install the packages from the remi repository (which ARE compatible and have no dependency issues).
You also need to be sure you have disabled or removed the conflicting repo (IUS).