Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f92e64a1d9fa3b6a8dec05f2f52ded5c11ac826b0d18a0d3a2a0caa30137fb' 
  AND token = 'x6mlQmgZL/sRRW3Zaoen65kDnPfvyPgobvAoHpbHylw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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