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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4507b23f4b8f424c1edf6106eccc98cdcf994c6884aa2f46594f1ebc0aeecdcd' 
  AND token = '/a1OsWEmQMlRE8PkEsZnuaIzGOC7MQGx/ZJtagf2lLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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