SELECT 
  cscart_product_features.status 
FROM 
  cscart_product_features 
  INNER JOIN cscart_product_feature_variants ON cscart_product_features.feature_id = cscart_product_feature_variants.feature_id 
WHERE 
  cscart_product_feature_variants.variant_id = 125

Query time 0.00010

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_feature_variants const PRIMARY,feature_id PRIMARY 3 const 1
1 SIMPLE cscart_product_features const PRIMARY PRIMARY 3 const 1

Result

status
A