Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff2c8c6b33c9af1f7fc3195ba19d5ddb341baf0f0ba86730950fddc7de71474' 
  AND token = 'dwYdWDJFXtcU1GGYQr9hoCY7QQj4heqiDYJ6RiioWR8=' 
  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"
    }
  }
}