SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0f97911b809f75fe85414c9693a637934f99169cf1e1161bb02fb7545705af' 
  AND token = 'KhCw4mnVhnSDRpIkybmenSMYIUvZi2QQijzRrQBqK8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}