Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38caaf2342b6d38838a0b3d2867ece0c5960daca3d307bd5d50b4ebe80fbb25' 
  AND token = 'Y/kVz9LBiU7fEv58Lc3dDpPjMqYRE1ihcJQd0AEjYdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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