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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd66a9c9b3b8a729649d2cb3fc11c9c4157ae9a3594148ee6e8a7072e13fd182' 
  AND token = 'Evz+0V7QjD51fP5nXS9cZYAQXnD9zugVk0WEbAjGotw=' 
  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"
    }
  }
}