Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294d6ff96e6f8af1bd715528ebf3eed2bf3b2b3801aa7fb609077759f75ccc3b' 
  AND token = 'QXocXXVYAf+8pvyMpAvm+cmis4tawM+kHWA7vkvltZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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