Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f36d483c1166ff5e97eb31d41d05787d37b849e797446666047f3572909bd8b' 
  AND token = 'ZSFe2hUL09mKD0hFXAagH/f3f+SErpfGOT+EQAOWc2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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