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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1b78fdfd311b44cda119407a43ee2f019be0a8bd665a08f68736f1cb98fc34' 
  AND token = 'PQda+J1DN6a1Ki00cFeXC5fabQ6//FqjhPxStwpxwBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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