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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f38be884bb4dd927f3c0edb44d50e8e1881538b0ffac3b6de1fb3dcf7da2f86' 
  AND token = 'G+XhXqWY9/u5iYAiF6ZLObYq0v39kIlIv8lMsVpXuA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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