SELECT 
  cscart_product_feature_variants.variant_id, 
  cscart_product_feature_variants.position, 
  cscart_product_feature_variants.color, 
  cscart_product_feature_variant_descriptions.variant 
FROM 
  cscart_product_feature_variants 
  LEFT JOIN cscart_product_feature_variant_descriptions ON cscart_product_feature_variants.variant_id = cscart_product_feature_variant_descriptions.variant_id 
  AND cscart_product_feature_variant_descriptions.lang_code = 'ja' 
WHERE 
  cscart_product_feature_variants.variant_id IN (
    52, 53, 54, 89, 58, 45, 55, 56, 39, 44, 91, 
    46, 47, 88, 48, 49, 50, 92, 59, 60, 61, 
    62, 63, 64, 41, 51, 94, 93, 95, 97, 98, 
    99
  ) 
ORDER BY 
  cscart_product_feature_variants.position ASC, 
  cscart_product_feature_variant_descriptions.variant ASC

Query time 0.00091

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "cscart_product_feature_variants.position, cscart_product_feature_variant_descriptions.variant",
      "temporary_table": {
        "table": {
          "table_name": "cscart_product_feature_variants",
          "access_type": "ALL",
          "possible_keys": ["PRIMARY"],
          "rows": 158,
          "filtered": 20.25316429,
          "attached_condition": "cscart_product_feature_variants.variant_id in (52,53,54,89,58,45,55,56,39,44,91,46,47,88,48,49,50,92,59,60,61,62,63,64,41,51,94,93,95,97,98,99)"
        },
        "table": {
          "table_name": "cscart_product_feature_variant_descriptions",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["variant_id", "lang_code"],
          "ref": [
            "smscrm_edev.cscart_product_feature_variants.variant_id",
            "const"
          ],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(cscart_product_feature_variant_descriptions.lang_code = 'ja')"
        }
      }
    }
  }
}