SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b659958b67f3456f9bb28c66695440dbf1af7031802af39e62b464368b0a9a7' 
  AND token = 'CNr+npkrHkX1PDHOgysWpFd7pu6YGbRL3f/vVwZG5Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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