Encontre Long/Lat dentro do polígono com MySQL 5.6

SELECT l.*,  ST_CONTAINS(p.boundary, POINT(l.Longitude, l.Latitude))
FROM locations l
CROSS JOIN polyThing p;

SELECT l.*
FROM locations l
JOIN polyThing p
  ON ST_CONTAINS(p.boundary, POINT(l.Longitude, l.Latitude))
 AND p.testarea = 'Test Area 1';