Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27d5b162fb75cfaf4ce4d2e7106ab0490ee0ed7ebf99d5d85a0188404a706e9' 
  AND token = 'zsroGL9nPw7M72dUG5bKS8dmmRKatnoUtmKe3BwTrEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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