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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b90fb8c4416dee9e0718e9d714c887956f1f350810fc2fa707e0858b6bb7a9b' 
  AND token = 'CgsaeGAyBybE71VwpX1a0wp8S+aQiJNq6qw7x45Xntg=' 
  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"
    }
  }
}