Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b08e6384734544f00283c0ea19ec9d25443689881f91378da39beb913363ff6' 
  AND token = 'HASecGqmBlweIMzRRe9ff/VXTxVfcQz18Q9HZxYtwvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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