Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1619d04bccb2bd9d8672a8c5e2e9c06f1d3cb1277621cc93ca31c413b0af19c' 
  AND token = 'J/LSYYHgWIGMHL2NyR0bTyXfOYcGnj4rai4wEegKwlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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