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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bcbc5b9295e02660dad73cfef0d893a3c9c08da1ce35d194c7ceb71d039852' 
  AND token = 'bb1sGBYRVY5h4m6d12gVlXqykgbBKN4K0TE+pQGE2b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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