SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5914785a043fea8549a192ce6f3188945192fc73b2e770a0fe1f4c22c4d62c0d' 
  AND token = 'M5FU1Z2JWbQBjd19puBnAOGOheXUDosUw0jqAmAPYBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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