SELECT 
  feature_id, 
  variant_id, 
  value, 
  value_int 
FROM 
  cscart_product_features_values 
WHERE 
  product_id = 10222 
  AND lang_code = 'en'

Query time 0.00038

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_features_values ref lang_code,product_id,product_id_idx,product_feature_idx product_feature_idx 3 const 48 Using where

Result

feature_id variant_id value value_int
19 241 0.700
20 6058 1.100
21 96
22 98
23 102
24 107
30 6124
42 145
127 5895
128 5899
129 5902
134 5961
178 6311