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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8616d7a49bbe9e6e15cb12b3af5a649414b84f8e52a747863ed9670eb1751abf' 
  AND token = 'LvdGXeM3ip5ssdBGXLTRVLankRT9K4o6UiDi3KW5i/Y=' 
  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"
    }
  }
}