SELECT 
  value 
FROM 
  cscart_product_features pf 
  INNER JOIN cscart_product_features_values pfv ON (pfv.feature_id = pf.feature_id) 
WHERE 
  pfv.feature_id = 133 
  AND pfv.product_id = 15977 
  AND lang_code = 'en' 
  AND pf.status = 'A'