You probably should not be storing an image in a database. The database is literally the most expensive place where you can store binary data. DB size will grow fast and querying cost is high. You might end up with non-scalable and barely efficient solution of image hosting.
Store it in separate resource server, like Amazon S3 or anywhere else (local Nginx, Tomcat etc).
Instead you can store unique file names and/or full path to the file. In such a way you'll facilitate DB's workload and columns data will be readable, so you can quickly find desired picture. I'm not even talking about performance in general, simple benchmark will easily prove it.
