SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbdb5367d6398e479d74d745b193eb02dd44448c8d5e653cb17265039062fae' 
  AND token = 'OwFxp9SI2NlzkgK7+W/KG13ZR/iWCs8bjpzVwN5hZTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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