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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67aae480fc11feb110f5e9c81f67acad9c70b24a70f51f8a9aba9bfcf84a32a' 
  AND token = 'NvzrpGHJI+3mvuOtDjSSId+mNjhV3TfbOFXmbisSJu0=' 
  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"
    }
  }
}