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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed068f8df2505dd14a6a1e3b2766fe9a6f87d09b5117f300625b88bd80f358a' 
  AND token = '77/ubCMgOlA2Eo7MQtWFulnHo4OCtjM9PreHiQPiJKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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