SELECT 
  feature_id, 
  variant_id, 
  value, 
  value_int 
FROM 
  cscart_product_features_values 
WHERE 
  product_id = 9470 
  AND lang_code = 'en'

Query time 0.00047

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_id 3 const 77 Using where

Result

feature_id variant_id value value_int
42 145
24 107
21 95
23 6305
75 243
30 130
19 93 1.100
178 6309
129 5902
128 5899
127 5895
134 5960
20 6052 1.300
152 6095
152 6096
152 6094
136 5972
22 98
136 5973
136 5976
136 5977