SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22b95e4973d9c6e0a33cff54aa5495646cf82810e5c21d6452f1173769a5bc33' 
  AND token = 'KeND4uZkhMoN6PwIfgRG7Gu59lqmVWyCXzfqLg2WtxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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