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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd944a5e1e82783f164a8ffe8b8338936da94d6a7da49253f12aba7634ad3fc5' 
  AND token = 'Da6lziu8vwm9YkO9cs1YMvJRXYclpBf3u+5FXpQRP/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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