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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebb22c48905406df7c2be9a975092ef40939aa742374b92b1e1ea6b920b6147' 
  AND token = 'UInrpVpRdpxbU8kydBt8Q/TWMJj+Y+5d2ju2l1fqHlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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