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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a50485a79b7cae1b071f890aba4c3fbabe2529124017ae3582f60870b2339f' 
  AND token = 'pmU1KNpvWNfNJ0V142WJ9Wjc9Hn7xQLqEYAYpjFKHmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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