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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe10b64c8e056e12e73f7c011c0504eb43ce42e5d09d246d03204e1c5363b8d' 
  AND token = 'DSaYJpkk2FByW/XV8zyejtS6/Wqh6lciPuQZ6QM/a08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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