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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a56ead3e4ce10435a73996ead8d4f5af377fe37c464c547cba48aa5b891a7be' 
  AND token = 'hWpBTBQIXYSr3ayU5DQm+BgF7EzisBMq5gwgHog0kiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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