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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24aa7fe5ec926bfe0db45c2514a667c9646b9ff019acb18177e71f43c2d6fc4' 
  AND token = 'c1MyTqXy3bFXAaLji9DKMcazoVWcRau+Ois5iL6iqwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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