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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44990483bffd22654b6b767fc37598190108484c3178cbc418acc99aa8cb3603' 
  AND token = 'SW7KQsTA+4nDmmLAubz4hza1tx9wOsa+rc3u9rRNxdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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