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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38289fff863d8bb99b180ac9b0f105e6e6716ad80870e7058060213f0e3c640c' 
  AND token = '/W9J2d4SCXuO+u1hrXOjkYPZB2TiVfbTS1BTodEkBKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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