Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ab2569d6bb539f6116b3bd7179f7e9ef202478d239e80c9be21a7c1823e5dc' 
  AND token = '8Wa/o6BPNBDwbHozqypxxPURq04dQsW32EPOU/JVLFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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