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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04eedc50d227e0813c6e5d116a31b63060003153ba2bf4a7368f1c22871ad89c' 
  AND token = 'FHLo51aS+0qwSqDABO0LNA22JFVlzi97DQDIaqvo7nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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