Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3569f4cf8bd84fa45cd7c9aa5a47f4aec5b9dac8b1a3b2087a1263fb7d53e7ba' 
  AND token = 'nPQATvrERxNeviVojaF9JaH++JoKAT7jHUZCxZM7YyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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