Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c9185d5f397a9e276f9742e4020c65037a1de880635be7f0f745fd63755d57' 
  AND token = 'Chx835O63JxpNSOSgUS5qD+RoUX6WjyMPuUQB3+BR2s=' 
  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"
    }
  }
}