SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'fr' 
  AND lang.name IN (
    'ec_whatsapp_support.button_text', 
    'ec_whatsapp_show_chat', 'ec_whatsapp_support.header_text', 
    'ec_whatsapp_support.subheader_text', 
    'ec_whatsapp_support.agent_name', 
    'ec_whatsapp_support.message_text', 
    'ec_whatsapp_write_your_query', 
    'ec_whatsapp_support.button_text', 
    'ec_whatsapp_show_chat', 'ec_whatsapp_support.button_text', 
    'ec_whatsapp_support.button_text', 
    'ec_whatsapp_show_chat', 'ec_whatsapp_support.header_text', 
    'ec_whatsapp_support.subheader_text', 
    'ec_whatsapp_support.agent_name', 
    'ec_whatsapp_support.message_text', 
    'ec_whatsapp_write_your_query', 
    'ec_whatsapp_support.button_text', 
    'ec_whatsapp_show_chat', 'ec_whatsapp_support.button_text'
  )

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "392",
      "used_key_parts": ["lang_code", "name"],
      "rows": 7,
      "filtered": 100,
      "attached_condition": "lang.lang_code = 'fr' and lang.`name` in ('ec_whatsapp_support.button_text','ec_whatsapp_show_chat','ec_whatsapp_support.header_text','ec_whatsapp_support.subheader_text','ec_whatsapp_support.agent_name','ec_whatsapp_support.message_text','ec_whatsapp_write_your_query','ec_whatsapp_support.button_text','ec_whatsapp_show_chat','ec_whatsapp_support.button_text','ec_whatsapp_support.button_text','ec_whatsapp_show_chat','ec_whatsapp_support.header_text','ec_whatsapp_support.subheader_text','ec_whatsapp_support.agent_name','ec_whatsapp_support.message_text','ec_whatsapp_write_your_query','ec_whatsapp_support.button_text','ec_whatsapp_show_chat','ec_whatsapp_support.button_text')"
    }
  }
}