SELECT 
  COUNT(*) 
FROM 
  cscart_seo_names 
WHERE 
  1

Query time 0.00007

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_seo_names",
      "access_type": "index",
      "key": "dispatch",
      "key_length": "194",
      "used_key_parts": ["dispatch"],
      "rows": 398705,
      "filtered": 100,
      "using_index": true
    }
  }
}