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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef3cc56e5c0702d2ef4def58f9bbb0a9b9073257c77174acc7fbb66266069d8' 
  AND token = 'WQ1yoUFmWbJKAOXnl1WzmTSpO70LcYbm3WvCBHiYPq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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