SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e73957c69eaa9d315691c98f0935c15b916c62fb984b397e64457d86267168' 
  AND token = 'I04hQ8gfAnlvjuw/KOfdLc9ypzuW1jZTlfVBJSdVgpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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