SELECT 
  feature_id, 
  variant_id, 
  value, 
  value_int 
FROM 
  cscart_product_features_values 
WHERE 
  product_id = 8894 
  AND lang_code = 'de'

Query time 0.00059

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 115 Using where

Result

feature_id variant_id value value_int
23 103
23 101
19 5989 0.600
30 240
127 5895
128 5899
129 5902
42 145
22 99
21 96
24 107
20 6059 1.000
134 5962
178 6308
152 6118
152 6116
152 6106
152 6105
152 6102
152 6101
152 6100
152 6097
152 6096
124 0 5702326178764
149 0 5702326178801
152 6095
152 6094
152 6093
152 6092
152 6090
152 6089