SELECT 
  1 
FROM 
  cscart_language_values 
WHERE 
  lang_code = 'en' 
  AND name = 'erp_delivery.address_search_searching' 
LIMIT 
  1

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_language_values",
          "access_type": "const",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "392",
          "used_key_parts": ["lang_code", "name"],
          "ref": ["const", "const"],
          "rows": 1,
          "filtered": 100,
          "using_index": true
        }
      }
    ]
  }
}