SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da2eef8e5cad937fb7d314eaec8bc4c206f254df09efb3128667ad9eee3ce49' 
  AND token = 'gvk6XZBofapLq4NiI4jSwKnpM3JqriGjYsnEtKW+XPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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