Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6913d5e22b024f5f09ce24064e9279ff4d5611ecf474f5ff5d5d31bf3e559b' 
  AND token = 'vsmgzXJq3s6Syc6B6rMUpc6ZFVXXL2VzDgjwdahzAf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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