SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565162d583b48879baacf95dfcae6a7216c5094d7412c782896ab3eaa782a994' 
  AND token = '7GgyQCzSBwJF8CmycB/HGMTKGTPvGBheA3wqvJH2rrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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