SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e88f0569cfe9f1ae20673f58503985d57855d51cb3c2a9740208f970907692d' 
  AND token = 'qK7dML3hnwvOap+ZLBmPLix9+dGoc3ILbVGHRHJycQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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