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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0ee5966dbaac3850038ad61d3235380387f13096db1e6c5812bdcbe6f49da0' 
  AND token = 'l2arScS+UWpqS/9TBgKA8XxTbbo2ju88AnNG4gM3lek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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