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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8449ccb8b8b4bb4c5dc7dd3fba8036385cb6b1c5403d980fd966982eb9b9b42f' 
  AND token = '8432C0DZ6/LhUMEaKVexVSC8TuPYbeNKyGiNsGXoXNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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