Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e779e7f18f3784d2adbbeccbec986ddfd5f57b44156d216e8dddb036a07e52c1' 
  AND token = 'WSB5w3ngC1KA7KO86PCkP8MEipjFG7uvImeZTtw1C0A=' 
  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"
    }
  }
}