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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36ffc0d7450c697c72fc3c33afcfc05281c6afce2b23c79fa6c8a7fd2babd88' 
  AND token = 'a4BMOwfnsW88VlbE7zqSTFkX5FWUfHvlFFPNOkE8OOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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