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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da229dc9b70ecff4d5b05ec105c6e78e7651cb019236e61e87f657ee6e670191' 
  AND token = 'l55tqJW5I+4EYjsfu5MBTjGkDBvDEVU3Kbg37gYXAN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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