SELECT 
  feature_id, 
  variant_id, 
  value, 
  value_int 
FROM 
  cscart_product_features_values 
WHERE 
  product_id = 10076 
  AND lang_code = 'en'

Query time 0.00046

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 70 Using where

Result

feature_id variant_id value value_int
21 95
24 107
42 145
30 240
22 99
19 106 1.000
127 5895
128 5899
129 5902
134 6238
20 6052 1.300
149 0 5702328454125
152 6095
152 6094
152 6096
152 6092
178 6308
152 6101
23 6273