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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e3ff4210c14f303c18ba00627d8232def79769f328ed9006ba02e7b0621e67' 
  AND token = 'S25TXewZV6lLN8kaxrtklc5FNqC3pR2nVMsNKaGL9us=' 
  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"
    }
  }
}