Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb25a3ed3f6b0281c5a62f21248a581a1f61ce75ea5a5689f0b9129b71ba8de8' 
  AND token = 'Pamxn2pI/JGvHpRacheQXjml0pWSqKp1Yib2v3aQEmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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