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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b6e23435d11ceb62fc76e99be465f89e71e43c6cef4dbd2455cce31ee45606' 
  AND token = 'b2Y/6GwtZegcP9pyUFB/l9Hwf9tJs+u9V/tO0iBHJ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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