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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33acf8654a7135858dbd0062d4b888fe2757eee8c478b45396b658be2c78c761' 
  AND token = 'WLnnMAFpINC1o9uHFbQCDJ0KTrYAWxhM4qccZ8dTdpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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