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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d43237250f5c5c5199196e7b33f4cccaf50f5ff2a2f207fd418f4aa854e3d58' 
  AND token = 'VTZoySCdaYKvOQHaGjkRFF7gybiJ8oKNjQ0g5NSIljw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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