Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b64e82ce0ed53aedf8447235dfdb26b0b98acae61d55314e6848745c07d3b4' 
  AND token = 'tUaBliHB/3ivrD5nIyg/8wTh0SaZ8CslrP6c+i9ofGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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