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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a413892e84289d784587f9d7f0791d38be343f210b28299b017328fd51e84d' 
  AND token = 'R2CoKq0PNvPwKD+RqInwY59ZDUfbQ2mt/CU/GNdIEkU=' 
  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"
    }
  }
}