Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eadebb528a680612d4e20277b5722f51f5dbfc297430bd362a969ff8945ff73c' 
  AND token = '/OlgmoMpNyyf3nPzCgO3uT70fmfXwvs7lrT6GUvFgHY=' 
  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"
    }
  }
}