Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a231601f533f9e1ab106bc8689efa57080c0d8e75767336c52897fb284467fae' 
  AND token = 'ULf3sGY9sNgP3NBEIBtzjY0fm8NGmbYItQX58tMiqVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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