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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc3816705cf822f5d198a931c1e9ee64c99669552f82d18cb6d30d502d3b6d1' 
  AND token = 'Jf0SI4h1iFBVmgx36axg6hgGfXcRGo9DQbLi5fxEUW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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