SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04caf38d22f5a8a10d7449c6b7875bd6e690bb74b939a988d999d820b737889' 
  AND token = '/hh2RR4MaAOYBxhEFJkz3BZ4NF5u4POJHDRGOgxQqIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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