SELECT 
  lang.name, 
  IF(
    cscart_ult_language_values.value IS NULL, 
    lang.value, cscart_ult_language_values.value
  ) as value 
FROM 
  cscart_language_values lang 
  LEFT JOIN cscart_ult_language_values ON cscart_ult_language_values.name = lang.name 
  AND company_id = 1 
  AND cscart_ult_language_values.lang_code = lang.lang_code 
WHERE 
  lang.lang_code = 'kk' 
  AND lang.name IN (
    'vacancies.education', 'vacancies.experience', 
    'vacancies.schedule', 'vacancies.location', 
    'vacancies.desc', 'vacancies.responsibilities', 
    'vacancies.requirement', 'vacancies.working_conditions', 
    'vacancies.novacancies', 'vacancies.education', 
    'vacancies.experience', 'vacancies.schedule', 
    'vacancies.location', 'vacancies.desc', 
    'vacancies.responsibilities', 'vacancies.requirement', 
    'vacancies.working_conditions', 
    'vacancies.novacancies'
  )

Query time 0.00072

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "9.46"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "lang",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "lang_code",
            "name"
          ],
          "key_length": "392",
          "rows_examined_per_scan": 9,
          "rows_produced_per_join": 9,
          "filtered": "100.00",
          "index_condition": "((`test_uchur_k`.`lang`.`lang_code` = 'kk') and (`test_uchur_k`.`lang`.`name` in ('vacancies.education','vacancies.experience','vacancies.schedule','vacancies.location','vacancies.desc','vacancies.responsibilities','vacancies.requirement','vacancies.working_conditions','vacancies.novacancies','vacancies.education','vacancies.experience','vacancies.schedule','vacancies.location','vacancies.desc','vacancies.responsibilities','vacancies.requirement','vacancies.working_conditions','vacancies.novacancies')))",
          "cost_info": {
            "read_cost": "5.41",
            "eval_cost": "0.90",
            "prefix_cost": "6.31",
            "data_read_per_join": "3K"
          },
          "used_columns": [
            "lang_code",
            "name",
            "value"
          ]
        }
      },
      {
        "table": {
          "table_name": "cscart_ult_language_values",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "lang_code",
            "name",
            "company_id"
          ],
          "key_length": "396",
          "ref": [
            "test_uchur_k.lang.lang_code",
            "test_uchur_k.lang.name",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 9,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "2.25",
            "eval_cost": "0.90",
            "prefix_cost": "9.46",
            "data_read_per_join": "3K"
          },
          "used_columns": [
            "lang_code",
            "name",
            "value",
            "company_id"
          ]
        }
      }
    ]
  }
}