Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a44d1d887ee9c9846d4238df4f6cbc68ef4fbbbbe6e99dbc7658309a19061d2' 
  AND token = 'hE1+PV6M7ul9VR6eeu5sOMNrutSlg9lnv/EE/a7/VJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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