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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9814bd3b61616b5f2442127c7105511aaf4b7ae7c20de615999ff60e9554f91' 
  AND token = '3OkRMlZTZY1WvoetU6Ns4O8Is0OlsQ7qNWjKTruRBxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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