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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505494f39c163936b66253916690b06658f761ca24a643b676879832c37c58dc' 
  AND token = 'CNKA6Tnmdw6HStcw2xTmlcMLn7YQjVGJnUe8vPL+wwA=' 
  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"
    }
  }
}