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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7441d13308c8ac50661c36962963528e36285696f1071ab0664c30701ae3d196' 
  AND token = 'CbgoDPY3l5GlvD7TnnQXyQiNtbopfBRVu03fcA2nua4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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