Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e464e3662a9e026c7403304bac7d868724be8f20d41937c62111d03750202c9' 
  AND token = 'XDt6OMxYwHWo2lfxyUqWLgLuAAtWkJrJxVytsaKNbw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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