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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a33970fa48245502e92e7690198007881333ef9c9d9f7fe3ccd6b02bfec6e5' 
  AND token = '5Zsx8q7kl8ufnlKc12/p+DmBk21AMQyHpjZZQAF3nAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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