Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83d37cc98b40ee90e12bd98cfeddf69e6706765f020ac1fef91aee2b1b1bf7e' 
  AND token = 'EQg0FTt2vzxV47f3ic4ltsz9dDeMslWKzrvU6gVZolU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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