Either:
=AGGREGATE(15,6,C2:C9/(A2:B9<=10),1)
or, array formula**:
=MIN(IF(A2:B9<=10,C2:C9))
If there may be blank cells in B2:C9
:
=AGGREGATE(15,6,1/(1/C2:C9)/(A2:B9<=10),1)
or:
=MIN(IF(A2:B9<=10,IF(ISNUMBER(C2:C9),C2:C9)))
Regards
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