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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d96f50d6b8ee306d0466f86c29f5f75c4042787185ea14b6dc39e48b8be4476' 
  AND token = 'JRkVbcQ9sRI4HoJXzS5jAMp5xYdiyJ92NS9QXeiIVRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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