Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a4507b66936a73812c3c2c0e04719f59e7ce1999aa93fa328610c910665f9e' 
  AND token = 'Kg0Ej2KduUwyJWlUpD7AsgE0h0zWjwtHEjMhsiFeUw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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