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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae3b3861223a1e26a39abd76550ab073f5a3858ef805493ce395b99b8d79a25' 
  AND token = 'WZP0jXj1hrGHwq8PWhPw9n9JiqdTxdFZapU//3ORLEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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