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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01348dcab8b91c58e97dc40505b95ba235ec10a7399ea9bd610b08409b009464' 
  AND token = 's5bzN8BaqyftJFic9mz49XefmUzYTUOXBU62LEAK3Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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