Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d21570ed4d152046bec09148a27a42bc9f7c4bd15a1f40628702e5238892d30' 
  AND token = 'b7Q+fPDbk0SjT3u4xwG+uQfI16xIDIf0bphRii5FX54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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