ST_WITHIN

ST_Within(g1, g2)

Returns 1 or 0 to indicate whether g1 is spatially within g2. This
tests the opposite relationship as ST_Contains().

ST_Within() handles its arguments as described in the introduction to
this section.

URL: https://dev.mysql.com/doc/refman/8.0/en/spatial-relation-functions-object-shapes.html