Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7253cb856150f632d9c9c594e1aa52b3071b06cedf5186abeb9a0de0f5f38dd3' 
  AND token = 'vNHM7QkON1MQ5XxhYofV4VvXMC+qIuQto6eYY8KwZcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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