Optimizing a MySQL query created with Navicat GUI

Using the Navicat for MySQL query gui, I made this

SELECT SS_Student_Schedules.Id AS StudentID, SS_Student_Schedules.ClassCode as CourseID, SS_Class_Master_Local.Period_1 as Period, SS_Class_Master_Local.Sect as Section FROM (SS_Student_Schedules INNER JOIN SS_Class_Master_Local ON (SS_Student_Schedules.ClassSect = SS_Class_Master_Local.Sect) AND (SS_Student_Schedules.ClassCode = SS_Class_Master_Local.Class) AND (SS_Student_Schedules.Schl = SS_Class_Master_Local.School)) INNER JOIN DG_Student_Master ON SS_Student_Schedules.Id = DG_Student_Master.StudId WHERE (((DG_Student_Master.CurStatus)='C' Or (DG_Student_Master.CurStatus)='R' Or (DG_Student_Master.CurStatus)='O'))

It pulls the correct data, but it is extremely slow. Is there anything I can do to optimize it? Thank you!