SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e635f9ec39440fa1a7133a9b9d337796e02e816f73d719be7af58b6407054f58' 
  AND token = 'PjowZewzNtguWu5QU5XOEzdB/J59Dl+oddvlJbGAxDU=' 
  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"
    }
  }
}