Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cebfbcfc411868838af6f3d34f705dccf4f6c62fa8b018449d3a33365dfae98' 
  AND token = 'DwETG5q2umk2n+gbO9nfMsfev0ti45vuzhEkyOcLTkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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