SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2894a31b7c64f70a3ab8320d348c2fdc4c6cde4852f7ee6f9c4caf0a270bcd64' 
  AND token = 'fnzGw+rP9cKqg2v+BbUpdgrhNUPVbqj55vIcoKNSUuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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