SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1224a220ea911fba9055d8e7e873f1dadf930293971917a95999f752df9a4693' 
  AND token = 'AD8i3GzSKuHRgqSwJOGzUDnU+CzYIp+FAFAYLkUmnsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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