SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea4658d2a32879ffed5980151e7f901564bdb8776dcf3b986be1ca9fd13e1fc' 
  AND token = 'S6eWBQYbsSDHpJz8PTrzpFGgmBh2KmqWZ/epcgtsWDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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