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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7ac1f18c78872d6e4fbe00017872ef9dabe43744e6b025abbfd60bc6350d36e' 
  AND token = 'UOr0sfl70nJUZ45j1cmbHOxTw0CqNYjmBy90LvO/GNQ=' 
  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"
    }
  }
}