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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f72ec532c358f7036fd4f911cf0ad77d1bceacf1c21445a0082589a70baef87' 
  AND token = 'E/8PpcBpZVQsbnN24MXITBd1w+n6+YaUu8RtjKYmxZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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