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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bf3d9b4fb6f8c3c29768a6f04275e26b013d340d21b577840a1b3d9224bc888' 
  AND token = '/asTzFU6sgk/6vCOSlEVW1QDNa0qS2n6ArvxHgJUckg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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