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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489e953deee71c87e6b121c36301201eaf12d6d9a4e702f86b93b6ca7a7991dc' 
  AND token = '05Q4F1zUsj7h8k45ZwTtrAtJpp46QMbKdsrMXsPuneE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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