SELECT 
  product_id, 
  feature_id, 
  variant_id 
FROM 
  cscart_product_features_values 
WHERE 
  product_id IN (
    45574, 45834, 45833, 45832, 45831, 45830, 
    45829, 45828, 45827, 45826, 45825, 
    45824, 45823, 45822, 45821, 45820, 
    45819, 45818, 45817, 45816, 45835, 
    45836, 45837, 45838, 45839, 45840, 
    45841, 45842, 45843, 45844, 45845, 
    45846, 45847, 45848, 45849, 45850, 
    45851, 45852, 45853, 45854
  ) 
  AND feature_id IN (24634, 24635) 
  AND lang_code = 'vi'

Query time 0.01286

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_features_values",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "fl",
            "lang_code",
            "product_id",
            "fpl",
            "idx_product_feature_variant_id"
          ],
          "key": "PRIMARY",
          "key_length": "6",
          "used_key_parts": ["feature_id", "product_id"],
          "rows": 125,
          "filtered": 66.40000153,
          "attached_condition": "cscart_product_features_values.product_id in (45574,45834,45833,45832,45831,45830,45829,45828,45827,45826,45825,45824,45823,45822,45821,45820,45819,45818,45817,45816,45835,45836,45837,45838,45839,45840,45841,45842,45843,45844,45845,45846,45847,45848,45849,45850,45851,45852,45853,45854) and cscart_product_features_values.feature_id in (24634,24635) and cscart_product_features_values.lang_code = 'vi'",
          "using_index": true
        }
      }
    ]
  }
}