SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f04ad87f6a81417ba5bb78980df408e73b4fe26f9102d477d05a5663fc16f6' 
  AND token = 'ZB9QhwsrFTiWnZcUUglA6sxgIEH/c2bML9h8LjOJ3BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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