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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c2c449662ec391486d8b6abed853ba90e87f9c6a086989a2f80bd0ca538675' 
  AND token = 'wG2DFcmJn0qgO5eahLyBpLUi7+0MvpB4gCM3JHUoNSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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